Fractions of granite crushed stone and its application

A popular building material with a granular structure is granite crushed stone obtained from igneous rocks with impurities of spar, quartz, mica and other components. The production technology involves crushing the rock to obtain a fraction of the desired size. 

Taking into account the specifics of the planned use, you can buy granite crushed stone in Ukraine in a wide range of fraction sizes of red, gray, pink hue for use in the construction industry.

The main characteristics of crushed granite

Several criteria are crucial to explain the great popularity of this structure:

• strength indicators reach the level of M1400. Any other type of crushed stone cannot compare with this material in terms of strength. This parameter is characterized by the value of the stone's resistance to compression and the crushing process;
• density at filling is 1.4 t/m3;
• excellent adhesion properties in terms of the possibility of reliable adhesion of granite crushed stone to binding components. This makes it possible to ensure the required strength of structures;
• ability to withstand a large number of freezing and thawing cycles without any problems.

The samples of fractions of such material offered in the Granum product catalog are checked for compliance with the regulatory requirements of DSTU B V.2.7-75-98 7392 2002. 

Types of granite crushed stone by fraction sizes 

First of all, the material is classified by grade according to its strength characteristics - weak, frost-resistant, medium, strong, and high-strength. There is also a division based on the size of the fractions:

• granite screenings up to 5 mm. The most practical and aesthetically pleasing element of sprinkling for sports grounds and pedestrian paths. It is also used as a component for the production of certain types of concrete;
• granite crushed stone up to 10 mm has practically no dust impurities and is an invariable element in the technological process of manufacturing cement mortars and products;
• one of the most common options is a fraction of up to 20 mm. It is used for the construction of roads, foundations, bridges, and various structures;
• parameters of up to 40 mm are relevant for the production of reinforced concrete products, during the construction of roads and railways;
• a large fraction of crushed granite from 60 mm is in demand in the production of massive structures. An example is the processing components for large fences or swimming pools.

The smallest screenings are widely used in many construction works and are obtained by screening the rock or by intensive crushing of the material. Sometimes it is necessary to use it not only as a component of concrete products, but also as an anti-icing agent.

Granite crushed stone - areas of application

The use of screenings is in great demand in a number of technological operations:

• during the creation of original ceramic products;
• for the manufacture of concrete products due to excellent strength characteristics that improve the quality of concrete;
• construction of filtration systems;
• as an aggregate material for recreation areas and paths;
• screening of granite crushed stone has no alternative in the production of paving slabs;
• arrangement of roads and highways;
• as an important component for the production of mixtures to be used in construction, decorative and finishing works;
• production of wall panels.

Companies that care about their reputation supply granite crushed stone to the sales market with one hundred percent compliance with sanitary, epidemiological and hygienic standards. 

Granite crushed stone - properties

Several criteria mainly influence the choice of this material for the needs of the object of application or use in various technological processes.

• Granularity

This parameter determines the presence of needle and lamellar grains in the overall structure. In general, we are talking about samples in which the length characteristics exceed the width and thickness characteristics by three or more times. Such impurities increase the void between individual elements of the mixtures. There is a need to increase the number of binding components, which does not have a good effect on the strength of the structure.

The conclusion is that reducing the crushability of granite crushed stone improves the quality of the material. According to the current DSTU, this indicator is classified as follows:

1. Group I - rolled crushed stone with a crushability of up to 10%.
2. Cubic group II - 10-15%.
3. III improved - 15-25%.
4. IV ordinary - 25-35%.

• Frost resistance

This criterion determines the ability to withstand a certain number of thawing and freezing cycles. 

Marking depending on the degree of frost resistance is as follows:

• F15;
• F25;
• F50;
• F200;
• F300;
• F400.

Usually, grades from 200 to 400 cycles are recommended for construction work.

• Radioactivity

Depending on the scope of the planned application, a material is selected that belongs to a certain group according to the value of the total amount of specific activity of radionuclides of natural origin.

Classification by radioactivity of granite crushed stone:

1. Up to 370 Bq/kg is suitable for the construction of residential facilities.
2. 370-740 Bq/kg - permitted for use in the industrial and road sectors.
3. 740-1350 Bq/kg is a material for transport and road infrastructure, if it is located outside settlements.

In the latter case, a prerequisite is to cover the crushed stone of the third radioactivity group with a layer of other bulk material or soil with a thickness of 0.5 m or more.

• Strength

The characteristic of resistance to mechanical impact is formed according to certain parameters. These characteristics include the rock boundary, crushability indicators during compression in a cylinder, and wear in a shelf drum.

Granite crushed stone grades by strength:

1. High grade - M1200-1400.
2. Strong material - M800-1200.
3. Middle class - M600-800.
4. Weak - M300-600.
5. M200 is very weak.

It is impossible not to mention such a moment as the aesthetic appearance of the unique natural texture and elegant shade of this material. It is thanks to these properties that granite crushed stone has no alternative for creating exclusive elements when planning a landscape design and will be an exquisite decoration of a garden plot, summer cottage, country house, modern cottage, luxury villa.

A wide range of fractions allows each consumer to choose an option that fully meets the characteristics of the future work with the material, the preferences of the owner of the object, and the specifics of the technology for using crushed granite.